Receiver



J. M. 5. KING RECEIVER April 28, 1925. 7 1,535,480

Filed Oct. 29. '1923 Gum Mega Petented Apr. 28, 1925.

UNITED STATES I 1,535,480 PATENT OFFICE.

JOSEPH M. S. KING, OF EAST JEILL CREEK, UTAH.

RECEIVER.

Application filed October 29, 1923. Serial No. 671,499.

same.

My invention relates to improvements in receivers such as those used in connection with radio outfits, the object being to provide'a simple and compact arrangement of parts which-will be extremely sensitive and in which the magnet partially surrounds the coil, so as to protect the fine windings of the latter to a large extent, when the magnet, core and associated parts are removed from their containing shell.

With the foregoing and minor objects in view, the invention resides in the novel sub ject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Figures 1 and 2 are sectional views along the axis of the receiver, in planes at right angles to each other.

Figures 3 and 4 are transverse sectional views as indicated by lines 33 and 4--4 of Fig. 1.

In the drawings above briefly described, the numeral 1 designates a cup-shaped insulating shell having a removable cap 2 constituting an ear piece and formed with a central opening 3. The cap 2 is threaded in place and serves to'clamp a suitable diaphragm 4 between itself and the edge of the shell 1. Interposed between the diaphragm and the shell, I have shown a ring 5 having inwardly extending arms 6 and 7 which are inwardly offset from the diaphragm 4. Be-

' tween these arms and the side of the shell 1,

remote from the diaphragm 4, a substantially semi-circular magnet 8 is located, said magnet being in a plane parallel to the diaphragm. One end ofthe magnet 8 is secured by a bolt 9 to the arm 7, a magnetlc pole piece 10 being secured by said bolt between the magnet and said arm 7. The other end of the magnet 8 is secured by a bolt 11 to the arm 6, a suitable spacer 12 being interposed between the two. The bolt 11 also serves to secure the thickened end 13 of a second pole piece 14, to the magnet 8, and it Wili be seen from Figs. 1 and 3, that the two pole pieces 10 and 14 extend inwardly across the axial line of the diaphragm 4.

A tubular core 15 of magnetic material passes through the free end of the arm 10 and is riveted or otherwise secured thereto,

said core being coaxial with the diaphragm 4 and having its free end spaced from the pole piece 14. The core 15 carries a suitable coil 16 which is within themagnet 8 and thus protected to a large extent by the latter, when removed from the. shell 1.

Interposed between the core 15 and the pole piece 14, is an elongated armature 17 and from this armature, a non-magnetic connector 18 extends to the center of the diaphragm 4, The armature 17 is connected with the pole piece 14, preferably in the manner shown most clearlyin Figs. 1 and 2. In these views, an elongated spring 19 is secured at its center by a screw or the like 4 20, to the side of the ole piece 14 remote from the armature 17, t e ends of the spring being extended beyond the side edges of said pole piece, bowed as indicated at 21, and

then soldered or otherwise secured to the ends of the armature. Thus, an exceptionally sensitive mounting is provided forthe armature which will insure the most eflectual operation of the latter and consequent accurate vibration of the diaphragm 4.

Connections to the coil 16may be made in any desired manner, for instance, by means of the binding post 22 shown in Figs. 3 and 4.

By providing construction shown and described or a substantial equivalent thereof, a receiver is provided which will be simple, compact, sensitive, protected to a large extent against injury, and in every way desirable. from the details disclosed, they are preferably followed, but within the scope of the invention as claimed, minor changes may be made. I claim:

As excellent results are obtainable.

A receiver comprising a shell, a dia- 5 extending through of said pole pieces and spaced from the other, an armature in the space between said core and said other pole piece, a connection between said armature and said diaphragm said tubular core, a coil around said core, and an elongated spring secured at its center to the side of saidother I pole piece remote from said core, said spring mam-130' mature.

In testimony whereof I have hereunto affixed my signature.

JOSEPH M. S. KING. 

